Finding the Fourth Proportional to 39,061.35, 53,904.51 and 21,156.39

Step by Step Solution

1. Step 1: Write the proportion equation
   39,061.35 : 53,904.51 = 21,156.39 : x
2. Step 2: Convert to fraction form
   39,061.35/53,904.51 = 21,156.39/x
3. Step 3: Cross multiply
   39,061.35x = 53,904.51 × 21,156.39
4. Step 4: Simplify right side
   39,061.35x = 1,140,424,836.32
5. Step 5: Solve for x
   x = 1,140,424,836.32/39,061.35
6. Step 6: Final answer
   x = 29,195.74